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Business Details
32 Years
experience
Expert Gunite Pool & Spa Construction in The Hamptons
Casual Water has been a trusted leader in gunite pool and spa construction, restoration, and maintenance since 1994. Our team of industry-certified professionals brings over 30 years of combined expertise to every project, prioritizing safety, energy efficiency, and eco-friendly building practices. As the only pool company in the region certified green by the National Association of Home Builders, we integrate cutting-edge technology with proven methodologies to deliver durable, aesthetically superior results. Our commitment to transparency, client satisfaction, and adherence to strict timelines has solidified our reputation for excellence across Eastern Long Island. Founders Gregory Kirwan and Michael Hartman, both veterans of the pool industry, ensure every project reflects our core values of integrity, innovation, and accountability.

With certifications from the Association of Pool and Spa Professionals, National Swimming Pool Foundation, and National Plasterers Council, we maintain the highest standards of craftsmanship and service. Our dedicated staff manages projects from initial design through completion, offering personalized solutions tailored to each clients needs. Whether constructing new pools or restoring aging structures, we guarantee precision, quality materials, and a one-year warranty on all workmanship. Our collaborative approach with engineers, architects, and landscape designers ensures seamless execution, while our zero-surprises policy provides clarity on costs and timelines. For over 25 years, we have built lasting relationships with clients by consistently delivering safe, clean, and energy-efficient aquatic environments.
Services
Gunite Pool Construction Spa Installation Pool Restoration Maintenance Services Pool Design
Details
  • Year established: 1994
Highlights and features
  • We have over 25 years of experience in pool construction and restoration.
  • Our team holds certifications from APSP, NSPF, and National Plasterers Council.
  • We are the only NAHB Certified Green pool company in the region.
  • Founders are industry veterans with 30+ years of combined expertise.
  • We guarantee transparency with our Zero Surprises policy.
Associations and certifications
  • Association of Pool and Spa Professionals (APSP)
  • National Swimming Pool Foundation
  • National Plasterers Council
  • National Association of Home Builders (Certified Green)
Services
Gunite Pool Construction
Our gunite pool construction combines advanced engineering with premium materials for durable, custom designs. We manage every phase from excavation to finish work, ensuring energy efficiency and compliance with local codes. Clients benefit from our 25+ years of expertise and NAHB Green certification.
Spa Installation
We design and install luxury spas tailored to client preferences, integrating energy-efficient technology and eco-friendly practices. Our certified technicians ensure seamless installation, from structural integrity to water quality systems, backed by a one-year warranty.
Pool Restoration
Our restoration services revive aging pools with structural repairs, surface resurfacing, and modernized filtration systems. We address vinyl liner conversions and complete gunite repairs, adhering to industry standards while preserving aesthetic appeal and functionality.
Maintenance Services
We provide comprehensive maintenance to ensure optimal pool performance, including cleaning, chemical balancing, and equipment inspections. Our certified service professionals prioritize safety and water quality, extending the lifespan of your investment.
Pool Design
Our design process focuses on client vision, space optimization, and eco-friendly materials. Founders Gregory Kirwan and Michael Hartman collaborate on layouts that balance aesthetics with practicality, ensuring each pool meets 21st-century standards.
People
Gregory Kirwan
CEO & Founder
Gregory Kirwan, a US Army Veteran with 30+ years in the pool industry, founded Twin Forks. He specializes in design and sales, emphasizing honest pricing and client-focused solutions.
Michael Hartman
President & Founder
Michael Hartman, a 30+ year industry expert, oversees construction management. He prioritizes timely execution and budget adherence, ensuring client satisfaction through quality craftsmanship.
Questions
What services does Twin Forks Pool & Spa offer?
We specialize in gunite pool and spa construction, restoration, maintenance, and custom design across the Hamptons and Eastern Long Island.
Are your pool construction services eco-friendly?
Yes, we are the only NAHB Certified Green pool company, using energy-efficient technology and sustainable building practices.
Do you provide warranties for your work?
All projects include a one-year warranty covering materials and workmanship, reflecting our confidence in quality.
How long does a typical pool construction project take?
Gunite pool construction typically takes 4–6 weeks, with the superstructure completed within 10 working days.
Can you restore old or damaged pools?
Yes, we offer full restoration services, from vinyl liner conversions to complete gunite repairs, bringing pools up to modern standards.
Reviews (4)
Larry Couture
Jan 19, 2020 Report
We have fourteen years of doing business with Greg and Jennifer and find them to be sharp, responsive and customer oriented Larry Couture
Scott Haugenes
Feb 02, 2018 Report
They did a good job with my pool but they haven't returned my calls or emails in regard to faulty equipment questions in over a week.this is my only resort to get a response
Christina Richman
Dec 30, 2017 Report
Been working with them for years now on my eco friendly system. They saved me a lot of money by saving my system which another company almost destroyed. They are reliable and easy to reach in case of emergency. Would highly recommend.
Joanie McDonell
Dec 27, 2016 Report
BUYER BEWARE! Our experience in dealing with these people was the worst. We would NEVER recommend hiring them UNDER ANY CIRCUMSTANCES. Particularly if you are interested in competency and honesty. (For some reason it is impossible to post a review without choosing 1 out of 5 stars. Thus we chose 1 instead of 0 simply to assure that this review appears)